[igt-dev] [PATCH i-g-t 4/4] tools/intel_gpu_top: Handle narrow terminals more gracefully

[Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>]

From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

Instead of asserting just skip trying to print columns when terminal is
too narrow.

At the same time fix some type confusion to fix calculations going huge.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Closes: https://gitlab.freedesktop.org/drm/igt-gpu-tools/-/issues/143
---
 tools/intel_gpu_top.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/tools/intel_gpu_top.c b/tools/intel_gpu_top.c
index 472ce3f13ba9..6d1397cb8214 100644
--- a/tools/intel_gpu_top.c
+++ b/tools/intel_gpu_top.c
@@ -926,7 +926,7 @@ static void free_display_clients(struct igt_drm_clients *clients)
 	free(clients);
 }
 
-static unsigned int n_spaces(const unsigned int n)
+static int n_spaces(const int n)
 {
 	static const char *spaces[] = {
 		" ",
@@ -950,7 +950,7 @@ static unsigned int n_spaces(const unsigned int n)
 		"                   ",
 #define MAX_SPACES 19
 	};
-	unsigned int i, r = n;
+	int i, r = n;
 
 	while (r) {
 		if (r > MAX_SPACES)
@@ -972,7 +972,8 @@ print_percentage_bar(double percent, double max, int max_len, bool numeric)
 	int bar_len, i, len = max_len - 2;
 	const int w = 8;
 
-	assert(max_len > 0);
+	if (len < 2) /* For edge lines '|' */
+		return;
 
 	bar_len = ceil(w * percent * len / max);
 	if (bar_len > w * len)
@@ -986,6 +987,8 @@ print_percentage_bar(double percent, double max, int max_len, bool numeric)
 		printf("%s", bars[i]);
 
 	len -= (bar_len + (w - 1)) / w;
+	if (len < 1)
+		return;
 	n_spaces(len);
 
 	putchar('|');
@@ -2001,8 +2004,7 @@ print_clients_header(struct igt_drm_clients *clients, int lines,
 				 4 : clients->max_name_len; /* At least "NAME" */
 
 	if (output_mode == INTERACTIVE) {
-		unsigned int num_active = 0;
-		int len;
+		int len, num_active = 0;
 
 		if (lines++ >= con_h)
 			return lines;
-- 
2.39.2